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collectionMystery2

Language/Type: C++ collections map set STL

Write the output produced by the following function when passed each of the following maps. Assume that a set displays itself in {10, 20, 30} format. 

void collectionMystery2(map<string, string>& m) {
    set<string> s;
    for (auto kv : m) {
        if (kv.first != kv.second) {
            s.insert(kv.second);
        } else {
            s.erase(kv.second);
        }
    }
    cout << s << endl;
}
{"cast":"plaster", "house":"brick", "sheep":"wool", "wool":"wool"}
{"ball":"blue", "corn":"yellow", "emerald":"green", "grass":"green", "winkie":"yellow"}
{"apple":"peach", "corn":"apple", "peach":"peach", "pie":"fruit", "potato":"peach"}
{"cat":"cat", "corgi":"dog", "emu":"animal", "lab":"lair", "lair":"lair", "nyan":"cat"}

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